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Installation, Operation, Maintenance and Parts Manual
Detroit Radiant Products Company
4.1 ELECTRICAL
WARNING!
The unit, when installed, must be electrically
grounded in accordance with the most current
national electrical code, ANSI/NFPA-70, when an
external source is utilized.
Control systems are energized by either 120 VAC,
24 VAC or millivolt energy. The 120 VAC systems
can be used directly from a 120 VAC line. On 24
VAC systems, transformers must be used to supply
power of sufficient VA rating for single or multiple
connected installations.
Millivolt systems require NO external power, as en-
ergy needed to operate the valve is developed by
the power-pile generator. Do not use multiple con-
nections, as one thermostat may only control one
heater.
Important: Proper grounding and polarity are
essential for heaters with spark ignition controls. If
the system is not grounded to a positive source, it
cannot determine the presence of a flame and will
lockout and shut off.
For wiring of controls on the unit see the wiring
diagram included on the provided insert.
It is recommended that the thermostat be installed
on the hot side of a fused supply line and have a
sufficient ampere capacity rating for the heater(s) it
will control.
The ventilation system may be controlled separately
from the heating system by use of a humidistat that
closes on a rise in humidity. The humidistat control
should be installed at roof level. For summer
ventilation, a simple on/off switch can be installed at
the occupant level.
OPERATION
Upon satisfactory completion of the electrical supply
and the purging of the gas supply line to the heater(s),
follow the "Lighting Instructions" on the heater's rating
label to put heater into operation.
Note: Do not attempt to ignite the pilot by hand on
heaters equipped with automatic pilot igniters.
Figure 4.1 TYPICAL FIELD WIRING
8
IR Series
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